Bring an older Primitive Technology post back up to the front.
These are sandals constructed from the narrow-leaf yucca. These designs are based on specimens preserved in caves. These might not be much to look at but they are remarkably impervious to the many sines, spikes, and other poky things found in the deserts of the west. These are two and four warp designs and the yucca is only slightly processed. The leaves should be dried prior to use and then re-wetted just before weaving. This prevents the normal loosening associated with shrinkage during drying.
These are being diplayed at the Blackwater Draw atlatl and Primitive Technology day 2008.
I intend to continue to research these and will try to compare types through use.
Preindustrial Craftsmanship 
These primitive sandals could be replicated with others natural materials (here we haven’t yucca…) with similar characteristics. It’s another project to try in the future, thank you!!